Both of them could do proper diagnostics, but only in combination with the right software as the Veepeak adapter or Enet cable are just tools to establish a connection between the car and your phone or laptop.
Also, a proper tuner wouldn't ask a client to bring their own Enet cable ha-ha!
On-topic: my car seemed to have about 10% more refrigerant in the A/C system than needed. I think too much refrigerant will cause too much pressure which will turn of the entire A/C system. Will see how it will do in the near future.
Cheers
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